74880821 has 4 divisors (see below), whose sum is σ = 75045132. Its totient is φ = 74716512.

The previous prime is 74880809. The next prime is 74880833. The reversal of 74880821 is 12808847.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (74880809) and next prime (74880833).

It can be written as a sum of positive squares in 2 ways, for example, as 69072721 + 5808100 = 8311^2 + 2410^2 .

It is a cyclic number.

It is not a de Polignac number, because 74880821 - 2¹⁰ = 74879797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74880721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81470 + ... + 82383.

It is an arithmetic number, because the mean of its divisors is an integer number (18761283).

Almost surely, 2^74880821 is an apocalyptic number.

It is an amenable number.

74880821 is a deficient number, since it is larger than the sum of its proper divisors (164311).

74880821 is a wasteful number, since it uses less digits than its factorization.

74880821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164310.

The product of its (nonzero) digits is 28672, while the sum is 38.

The square root of 74880821 is about 8653.3704994066. The cubic root of 74880821 is about 421.4928376458.

The spelling of 74880821 in words is "seventy-four million, eight hundred eighty thousand, eight hundred twenty-one".